Method of making leather tires.



No. 857,726. EPI TENTE JUNE 25. 1907 ,G. & A; DURIO & 1G. MARTINA.

METHOD OF MAKING LEATHER TIRES.

nrmourmn :innnrnn. 2.190s.

' a suture-snag.

INVENTORS:

UNITED sTAr Es PATENT OFFICE... I

GIACOMO; DURIO, ACHILLE DURIO, AND GIOVANNI M RTINA; QF'gTllfiIN,

' a ITALY. j

METHOD OF MAKING LEATHER r'|REs.

To all whom it concern; I

Be it known that we, GIACOMO DURIO and AQHILLE DURro, residing at Turin, Italy,

.great numbers, and along time ago.

Madonna di Campagna, and GIOVANNI MAR- TINA, residing at Turin, Italy, Via Buniva 23, Y

all subjects of the King ofItaly, have invented certain new and usefulImprovements in Methods of Making Leather Tires, of which the following a full, clear, and. exact specification.

Attempts to substitute for the usual tires,

which principally consist of india rubber,

- which have been used up tot 'epresent, by

means of which a tire is produced which fulfile the requirements necessary in motor cars and similar vehicles.

The present invention is shown in the annexed drawings, in which Figures 1 to 6 show the successive stages through which the material (41. e. the leather) passes before it assumes its final form, and F igs. 7 and 8 show in section and. in plan an 4 example of the apparatus employed in the to the shape shownin Fig. 5/

then, after a furtherprocess of modeling (carprocess of manufacture.

In 1ts general outlines the process of manufac.ture of'the'tires is" as follows: A circular leather disk 1, of a quality which may be best suitable for the purpose, for instance leather tanned according to the chrome process, is taken and reduced by suitable machinery to theshape seen, in Fig. 2, which.

shows the cylindrical rim 2 and thebottom 3.. The bottom' 3, which is not necessary, is then cut off, and the cylindrical rim alone remains, p i

- take, .so that first the external series of segments are impelled outwardly, and when as shown in Fig. 3; the 'edges 4 of same are slightly turned over, as shown in Fig. 4,

and the said edges are wedged in between rings or circular vises, and afterward the por tion of the rim 2, which is comprised between the said edges 4 is forced outwardby suitable apparatus thus reducing itapproximately Specification of Letters Patent. Application filed February 2,1906. $eria1No. E i 39.217.

This shape is Patented June 25, 1907 ried out, for instance, one mandrel) reduced to thefin-al pattern, (which varies according to circumstances) one example of which-is givenin Fig, 6. I

For the performance of the above men tioned operations, it is useful to employ the following machines or t0ols;'for changing the circular disk of Fig 1 to the shape of Fig. 2 'an apparatus is adopted, which comprises a piston, moving forward under great pressure and, entering a' cylinder which has a slightly larger diameter. according to .the thickness of the leather, the diameter 'of the leather disk being of course larger than the diameter of" the cylinder, and varying according tethesize tire required. This disk is arranged in such a manner that it closes the mouth of the cylinder concentrically to it, and afterward.

. the. piston is made to enter the cylinder'and,

pursuing its stroke, it forces the leather disk;- M

to assume the shape indicated in Fig-"2,

When the bottom, 3 has been cut off, the

edges 4 of the leather are inserted and tightlyheld between the rings 5 and 6 the latter be: ing first placed on the outside-of the edges. This being done, the piston is removed and the leather band 2, held between the rings 5 and 6, is-placed in an apparatus (Fig. 7 )comprising a part, external to: said band 2, having a cavity 7 of the shape which the band is; to take when it reaches the stage shown in Fig. .5,

On the-part'of the apparatus whichcomes inside of the band 2 a segmental ring 8 is arranged in such amanner that, by impelling its segments outwardly, the diameterof the ring increases, and vice versa.

that of the cavity 7 and of a suitable size. These segments maybe connected toeach otherin iris fashion as in,.certain photographic shutter apparatus, or they 'may be simply alternated, so that one series'is inside .of' the other when the diameter of the ring is less than the largest diameter which it may These segments are of a shape corresponding with" oted at one end onthe segments and at the l scarce in Fig. 5 to the-ultimate shape bysimply.

, a other upon collars ll, working upon screws cutting off the saidedges l, 4.

with inverse threads 10, The band 2 be- The material used in the process of manuing arranged as mentioned above, and with f acture described herein may be tanned, as 5 the left hand half as shown in Fig. 7, the EX: already mentioned, at the first, but green. 7 tension of the segments'S is commenced ,thus leather may also be employed, and submitted forcing the band 2 toward or into the cavity to the tanning process a after the work of 7. lit is, however, necessary to connect, first shaping it has taken place. As it may also of all, the two pairs of rings 5 and 6 with each happen that for certain tires one layerv or 10 other, for instance, by means of escrow rod thickness of leather alone may'not be sulii- 75 (or rods) with inverse threads, so that one eient, it may be useful to submit two or more pair cannot approach the other unless delayers to the shaping process simultaneously, sired; that is to say, unless said screw rod is producing thus atire of multiple layers. turned upon its axis. l t/ hen it is found that now particularly" described and p 1- the-band2 has been stretched and forced outascertained the nature our said invention 80 -ward a predeterminedamouut the actioriflof and in'what manner the same is to be pertheysegments 8 is stopped, and the pair of formed, we declare that what we claim is:

rings?) and 6 are caused to approach each l. 'ln the manufacture of leather tiresor other somewhat; then the movement outthe like, 'theprocess which consists in first to 'ward of the segments Sis set up again, and forming a sheet of leather into a seamless 85 the rings are caused 'tc approach more closely, cylinder, and then bending the latter to cause until the machine is brought to the position the edges thereof to lie inwardlyof the body shown to the right in Fig. 7 and the leather portion. I

band is of the shape-shown in Fig. 5. It is 2. In he manufacture of leather tires or obvious that the apparatus sllownin ig- 7 the like, the process which consists in first go may be varied in many ways, retaining, howforming a sheet of leather into a seamless 6 3 the Same pr e of g A imple cylinder, and thenbending the latter to cause m ans f p rf mi gh m We onsists the edges thereof to lie inwardly of the body for instance, in inclo'sing the rings 5 by port-ion by stretching such body portion oute means o'fhermetically sealed covers, making, war-Elly, I I a 95 1 so to spealqplaindisks of them, and then to 3, In the manufacture of leather tires or introduceinto"thechamher formed by these the like, the process which consists in first disks and the leather band afiuid under presf ing a h t of leather into a seamless Sure, Which WORM wt in the 831116 IIIELIIHEI' cylinder and then bending the latter to cause 3 5 the gm t to force the lesllhfil' h the edges thereof to lie inwardly of the body '100 cavity. 7.- Q 1 portionby stretching such body portion out- Asitmay be a'clyisableduring theoperawardly while progressively bringing such tion to maintain .the'leather at arelatlvely edges toward each other. high temperature, the apparatus shown in 4. Inthe manufacture of leather tires or n Fig. 7 may be provided with achamber 12, the like, the process which consists 1n iirst r05 for the circulation of steam or .hot water. forming a seamless annular structure having From the shape shown in Fig. 5, it can be cylindrical walls from a sheet of leather and altered, as already stated, in an obvious then; forming such structure into the shape manner to any type of definite shape, as for oiatire. 5.-instance that of ig. 6, and thus a leather 5 .11 i the manufacture leather tires or no tire m,ay be obtained, which is of the same the-like, the process which consists in form: shape ossesses the same properties, andcan fasheet 0 leather into the'forin of a cylbe app ied direct tothe wheelithe Sam 'iii derfhavinga bottom, removing such botindiarubber tires, over which it possess "tom and forming such cylinder into tire however, the advantage of greater resists shape. i 115 ance, greater durability and reater econf 6. .,In the manufacture of l th r I omyf For the purpose of furt or strength "the like, the process which 'conslsts in form ening the tires, especially against any possiinc a sheet 0 leatherlinto the form of a cyl bility of distortion, it may be useful'to proinderhaving a bottom, removing such botvide it internally with a layer of canvas of tom, and stretching the middle P0111011 of I20 cor-"res onding shape, which may be caused, such cyllnderradially outward. to adliiere to the internal surface of the" ln' wjtness whereof, we have hereunto leather by any suitable means. The tire ob si'gnediiiir names in the presence of two subtained in the manner described may also scribihg'witnesse'aw be adapted for use as a simple repair cover-i 4 GIACOMO DURIO. ing or for the strengthening of india rubber" AGHILLE DURIO. tires, being applied over the latter after pre- GIOVANNI MARTINA. viously domg away with the parts which are, 1 Witnesses: in that case, superfluous, viz, the edges 4, 4, iMamo Caruooro,

": Go'r'rAnno'. G. PIRONI.

thus passing direct from the stage shown 

